Variable-exhaust nozzle for engines.



-F. HAMILTON & C. R. TWYMAN;

VARIABLE EXHAUST NOZZLE FOR ENGINES. APPLICATION FILED 1123.11, 1909. I 977,301

Patented Nbv.29, 19-1 0'; 2 spams-sum 1.

1-". HAMILTON & 0. R. TWYMAN. VARIABLE EXHAUST NOZZLE FOB ENGINES.

APPLICATION FILED APB-.17, 1909.

977,301. Patented Now/(29,1910.

' 1 2 sums-snm.

Fig. 3.

UNITED sra'rns Parana @FEXQE.

FRANK HAMILTON, 0F BEARDSTO NN, AND CALVIN It. TWYMAN, OF GALESBUBG,

ILLINOIS.

VARIABLE-EXHAUST NOZZLE FOR- ENGINES.

Specification of lietters Patent.

Patented Nov. 29, 12310..

Application filed April 17, 1909. Serial No. 490,805.

To all whom it may concern:

Be it known that we, FRANK HAMILTON, a citizen of the United States, residing at- Beardstown, Cass county, Illinois, and CAL- VIN R. TWYMAN, a citizen of the United States, residing at Galesburg, in the county of Knox and State of Illinois, have invented certain new and useful Improvements in Variable- Exhaust Nozzles for Engines, of which the following is a specification.

Our said invention consists in certain improvements in the details of construction of variable exhaust nozzles for steam engines, whereby the forced draft through the smoke-stack may be regulated to suit conditions and secure the best results and back pressure avoided, all as will be hereinafter more fully described and claimed.

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts, Figure 1 is a side elevation of the front end of a locomotive having a portlon of'the side of the smoke-box broken out to show the exhaust nozzle embodying our said invention, Fig. 2 a horizontal section as seen when lookin downwardly from the dotted line 2-2 in Fig. l, the top plate of the nozzle frame being removed, Figs. 3 and l views showing modifications of the structure, Fig. 5 a sectional view through the top of the stand showing the means for securing v the nozzle regulating device thereon, and

Fig. 6 a detail perspective view showingthenozzle regulating slides separately.

In said drawings the portions marked A represent the nozzle stand and B the'nozzle frame.

The standA is, or may be, any appropriate stand. arranged to receive the exhaust from the cylinder of a. steam engine. such as shown in Fig. 1, or of any other form, or construction. It is mounted in the smokebox 10 at the front end of the boiler 11 and immediately beneath the smoke-stack 12 of the engine and receives the exhaust from the cylinders 13 in the usual manner. The

' frame B comprises a base plate of suitable size and-form and having-a ring I) on its under side (see Fig. 5) formed with a circumferential groove 5 in which the points of set screws 6 extending through the side of the standA, may-engage and thus secure said frame B firmly to the top of said. stand.-

Saidframe is formed with an oblongshaped frame B, while plate B is formed to slide in ways formed between the sides of plate B. Said plates are operated by means of a rod 14 one end of which runs to the cab of the locomotive, where it'is connected to an .operatinglever (not shown), and its other end connects with a crank-arm 15 on the outer end of a rock-shaft 16 which extends across the smoke-box from side to side and is journaled in suitable bearings in said smoke-box. A crank-arm 17 extends downwardly from the central portion of said rockshaft and connects with a pin 18 mounted in the front end of plate B. Thus the rocking of shaft 16 operates toslide said plate B in the frame B longitudinally.

4 Double endedlevers l9 and 20 are ccntrally pivoted in the front end of recess in frame B on pivots 21 and 22 and are con nected at their inner ends by a pivot 23 to the outer end of' a connecting rod 2 which is connected to the central portion of ,the sliding plate B The outer ends of said .levers are connected by pivots 25 and 26 to the ends of bars 27 and 28 which are secured to the outer edges of the sliding plate B. It will thus be seen that as plate B is slid back and forth, the levers 19 and 20 are rocked on their pivots and through the -connection described operate said plate B o' positely to" said plate B so that when s aft 16 is rocked in one direction said plates B and B are moved away from each other, to enlarge the opening throu h the exhaust nozzle, and when rocked 1n the other direction they move toward each other to contract said opening. The particular form of plates B and B is best shown in Fig. 6, by which it will be seen that each plate is formed with recessed edges which receive projecting side-pieces of the other plate, the sidc-pieces of one plate projecting from its top side and engaging recess yin the top corners of the opposite plate, as those of the other plate projecting from its lower side and engaging recesses in His lower corners of the said first mentioned plate. By this arrangement the joints ever-lap leakage is guarded against.

' in Fig. 3 We have shown a single slide plate B", which is inounl'ed and operated in same insixnor as plate l3. understoorhnf course, that in such a construction the plate must move double the distance to secure *bhe'serne contraction and expansion of the opening through "the exhaust nozzle as in the consirnction shown in Fig. 2. W e have shown on the sides of plalte l5 stop lugs Z) which engage with recesses in the sides of ihe Ways in the frame and serve to limit the longitudinal movement of said plate at the points desired.

In Fig. We have shown a construction similar to that shown in Fig. 3 except that two plates and two openings are shown instead of one. In such. a construction it will be only necessary to have two crank-arms, similar to the cranlearm l! on the rockshaft 16, each of which will be appropriately connected to the front end of one of said sliding plates. in such a construction the same result will be secured with the same degree of movement of the rock-shaft es in lheconsl'ruction shown in Fig. 2. 1

it is evident that other modifications in the details of constructioniney be employed without materially departing from she spirit of our invention.

By the construction shown in the several. views it will be noted that all openings for the sliding parts are toward the all of the smoke-box, the recess being; closedv on thesear side, thus preventing the leakage of slieam toward the boiler fines and guarding against the danger of back draft, or other interference with the drnfs through said fines, as the exhaust will be toward the front and away from the fines, thus aiding the draft instead of interfering with it.

Having thus ic'ully described our said invention, What We claim as new and desire tos ecure by Letters Peteni, is:

1. A variable exhaust nozzle for engines coinprisinge stand connected with the exhenst of the cylinders and lOCfiiHl in the smoke loci; beneath the smoke stock, a noszl frame secured in the top of said slend formed with a closed rear end and an open front end, sliding jflaies partially covering we opening in'sai nozzle and mounted to sliclefin said frame to enlarge or contract said opening the front plate being'arrnnge-d to slide through the open fronh of said frame, operaiin'g means connected to the outer end of said front plate adjacent to the It will. he

tween the plain and. the front plate for sliding said plates simultaneously, snbstan' tially as set. iorh.

23 A variable exhaust nozzle for engines comprising a 'slieml connected with the exhaus'b from the cylinders and located in the smoke-cox, a nozzle frame formed with its from; end. open and its rear end closed secured. in she to of said. stand formed with an opening an. a longitudinal way, a sliding pert in said Way of a form to control front of 'lhesrnoke-hon, and connections hethe-area of said opening as it is slid back and forth and; projecting beyond the front end of said frame, an operating rock-shaft, a connection between said rock-shaft and the front enclof said sliding part through the-open front end of said frame, and means for operating said rock-shaft, substantially as set forth.

3. In avarieble exhaust nozzle construction for steam engines, the combination, of

the stand connected'with the exhaust of. the

so. each other to vary the ares of the opening between them, substantially as set forth.

4. A variable exhaust nozzle for engines comprising a stand. with a lop nozzle i i-sine formed with an opening and onen'sl: its

front and closed at its rear, sliding; parts for controlling the area of said opening.

mounted in a. Way around the same, said sliding parts being formed w th inter-engaging overlapping edges, and means for operating saio sliding parts connected to the front end of the front part, whereby v the rear end of said frame msv he left.

closed, snbscennially as set forth.

In Witness whereof, wehave hereunto set our hands and seals at Gal'eshnrg, Ill. this l ldziy of April, A. l). nineteen hundred and nine.

FRANK HAMILTON. [1,. s]

CALVIN R. TWYMAN. [1,. s]

v filnesses v CHARLES L, BRANIIAM,

/VILLIAM JAMES Amnmmn. 

